R Cassiopeiae
{{short description|Star in the constellation Cassiopeia}}
{{distinguish|Rho Cassiopeiae}}
{{Starbox begin}}
{{Starbox image
| image = 250px
| caption = The visual band light curve of R Cassiopeiae, from AAVSO data
}}
{{Starbox observe
| epoch = J2000.0
| constell = Cassiopeia
}}
{{Starbox character
| variable = Mira
}}
{{Starbox astrometry
| radial_v = {{Val|−22.94|0.72}}
| parallax = 5.7423
| p_error = 0.2011
| dist_pc =
| absmag_v =
}}
{{Starbox detail
| age_gyr =
}}
{{Starbox catalog
| names = {{odlist | V=R Cas | BD=+50°4202 | HD=224490 | HIP=118188 | HR=9066 | SAO=35938 | ADS=17135 | CCDM=J23584+5123 }}
}}
{{Starbox reference
| Simbad = R+Cas
}}
{{Starbox end}}
R Cassiopeiae is a variable star in the northern constellation of Cassiopeia. It is located approximately 570 light years distant from the Sun, but is drifting closer with a radial velocity of −23 km/s. This is a pulsating Mira-type variable star with a brightness that varies from magnitude +4.4 down to +13.5 over a period of 433.6 days. At its maximum brightness, R Cassiopeiae is visible to the naked eye as a faint, red-hued star.
Norman Robert Pogson discovered the star, in 1853. This aging red giant star has a stellar classification that varies from M6e to M10e, where the 'e' suffix indicates emission features in the spectrum. Currently on the asymptotic giant branch, it has 59% of the mass of the Sun with an oxygen rich chemical abundance. Having exhausted the supply of hydrogen at its core, the star has expanded to 263 times the Sun's radius. On average, the star is radiating 3,837 times the luminosity of the Sun from its swollen photosphere with an effective temperature ranging around 2,812 K. It is losing mass at the rate of {{val|1.3|e=-6|u={{solar mass}}/yr−1}} and is surrounded by a dusty circumstellar shell that extends out to {{Val|2.8|ul=arcminute}}.
See also
References
{{reflist|refs=
{{cite simbad | title=R Cas | access-date=2019-08-17 }}
{{cite Gaia DR3|1944073004732961152}}
| last1=Cannon | first1=Annie J. | title=Second catalogue of variable stars | journal=Annals of Harvard College Observatory
| date=1907 | volume=55 | pages=1–94 |bibcode=1907AnHar..55....1C }}
| last1=Toone | first1=John | title=British variable star associations, 1848-1908 | journal=J. Br. Astron. Assoc.
| date=2010 | volume=120 | issue=3 | pages=135–151 | url=https://britastro.org/vss/JBAA%20120-3%20135%20Toone.pdf
| access-date=12 January 2025}}
| last1=Ducati | first1=J. R.
| title=Catalogue of Stellar Photometry in Johnson's 11-color system
| journal=CDS/ADC Collection of Electronic Catalogues
| volume=2237 | pages=0 | year=2002
| bibcode=2002yCat.2237....0D }}
| title=The interface between the stellar wind and interstellar medium around R Cassiopeiae revealed by far-infrared imaging
| last1=Ueta | first1=T. | last2=Stencel | first2=R. E.
| last3=Yamamura | first3=I. | last4=Geise | first4=K. M.
| last5=Karska | first5=A. | last6=Izumiura | first6=H.
| last7=Nakada | first7=Y. | last8=Matsuura | first8=M.
| last9=Ita | first9=Y. | last10=Tanabé | first10=T.
| last11=Fukushi | first11=H. | last12=Matsunaga | first12=N.
| last13=Mito | first13=H. | last14=Speck | first14=A. K.
| display-authors=1 | journal=Astronomy and Astrophysics
| volume=514 | id=A16 | pages=6 | date=May 2010
| arxiv=0911.4918 | bibcode=2010A&A...514A..16U
| doi=10.1051/0004-6361/200913455 | s2cid=54745858 }}
| title=Multi-epoch Proper Motion Magnetic Field Comparison of SiO Masers around R Cas
| last1=Assaf | first1=K. A.
| journal=The Astrophysical Journal
| volume=869 | issue=1 | id=80 | pages=19 | date=December 2018
| doi=10.3847/1538-4357/aaea65 | bibcode=2018ApJ...869...80A | doi-access=free }}
| display-authors=1 | last1=Samus | first1=N. N.
| last2=Kazarovets | first2=E. V. | last3=Durlevich | first3=O. V.
| last4=Kireeva | first4=N. N. | last5=Pastukhova | first5=E. N.
| title=General Catalogue of Variable Stars
| version=5.1 | journal=Astronomy Reports
| year=2017 | volume=61 | issue=1 | pages=80–88
| bibcode=2017ARep...61...80S | doi=10.1134/S1063772917010085 | s2cid=125853869 }}
| display-authors=1 | last1=Famaey | first1=B.
| last2=Jorissen | first2=A. | last3=Luri | first3=X.
| last4=Mayor | first4=M. | last5=Udry | first5=S.
| last6=Dejonghe | first6=H. | last7=Turon | first7=C.
| title=Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters
| journal=Astronomy and Astrophysics
| volume=430 | issue=1 | pages=165–186 | date=January 2005
| bibcode=2005A&A...430..165F | arxiv=astro-ph/0409579
| doi=10.1051/0004-6361:20041272 | s2cid=17804304 }}
| last1=Takeuti|first1=Mine | last2=Nakagawa|first2=Akiharu
| last3=Kurayama|first3=Tomoharu | last4=Honma|first4=Mareki
| title=A Method to Estimate the Masses of Asymptotic Giant Branch Variable Stars
| journal=Publications of the Astronomical Society of Japan
| display-authors=1 | volume=65 | issue=3 | pages=60 | year=2013
| bibcode=2013PASJ...65...60T | doi=10.1093/pasj/65.3.60 | doi-access=free}}
}}
{{Stars of Cassiopeia}}
Category:Cassiopeia (constellation)